May concern



EDWIN NEEN ALD, -OLFIURNER-,l MAINE."

Leners Patmzvo. 80,344, dated Juzyealses.

@the dgemh referrer Vt: in itesettters tant tub making glut nf itesm,

TO ALLWHOM IT" MAY CONCERN': Y

Be it known that I, EDWIN-FERNALD, of Turner, inthecountyof'Andxfoscoggin, andSltate ofjMaine,have invented a new andimproved'Device for Holding Tools 'againstGrindstones, Vand'dohereby'dee'lare that-thief following is a full, clear, and exactdescription rthereof,.whiehwill enable thosetskilled in ftheqart'tomakeand use the same, .reference being had tothe accompanying drawings,forxilingA partei' this s pecioation, in which-'-V Figure 1 representsa. vertical 'longitudinal-section of Inyimprovedmachine,"theffplaneoffsecton being" indicated-by the linexz, flg.v2.` "I f f n l VFi'gure'2 is a plan or top view ofV the same.

Similar letters of reference indicate corresponding parts. l yThisinvention relates to a devicev by which-'toolsihavng alongcutting-edgepuin :beheld against grindi stones, and can be sharpened,the device being so arranged that the bevel 'formedohd the tool .will beenti-rely uniform, and that its edge will be ground perfectly straight.:l l g The invention consists Ain the use of. a shoe -or clamp,whichsldesoua horizontal rod and which ismoved thereon by means ofchains passing over pulleys in the ,end of a stationary. frame;v

In the frontend of this shoe thetool to be groundispsecured,4 and byInoving the shoe on the said horizone` tal rodI the tool will bc drawnacross the edge of the grindstone. :The front part of the shoe res`ts-upon an I* 'adjustablesupporg the length of which is 'regulated by ascrew,so.that b y turningV the said screw the ltool can be brought asclose as necessary against the ngrindston'e. g V- y 4 y A represents abench, which is standing upon legs, Rand n which-the bearings forthefshaft of the grindstoneV C: are arranged. i l y D isa verticalframe, yczensi'stingot' the uprightsra a,,at the sides' ofA the bottonilplate 6,-?'an'dof the ,upper brace or plate c) VThis frame is set uponthe bench A,`and is secured to the same byarsor'e'wV or screwsandnutsgd, passing through the bottongb, of' theV frame D, and through aplate, e, which -isffarrahg ed on th'der side of the bench, as isclearly shownrin fig. .1. Y' I Y l :By loosening the nut onthe bolts dthe frame D can be VIl ngved nearer to or further' from the airis ofthe' grndst-one, and be fastened in any desired position. v i It-will beseen that the frame Dpor rath-er its Vtop and ,botto plates, arearranged parallel with the axis of-the g'rindstone C.` j V E isahorizontal metal rod, arranged lbetweenthe side pieces of the frame' Dl1 l F is a clainp 'or shoe, which has two `legs on its under side,'nearits rear-lend, =bywhich it is 'ttedupon and around the rod E, so as. toslide and turn thereon. V'.lwo chains,f fywhichiareseoured, to adrurr,y, onvthe upper plate c of the framel), and to the shoe F,`and whichpass over pulleysz, which are lxedt the'sides of the frameD, serve tolnove the shoe on the rod E, whenever the drum g is turned by' means ofa. crank, z', as shown. i g

v l G'is a horizontal lrail, arranged on or near the frontf part ofthe-bed-platez. H is ajointed rod which lits through a mortise in theshoe, 'and which is provided with-,a wheehj, on its'lower end, whichwheel tsiuto ork upon the rail G, asshown. I is a vertical-screw whichlits through a nut, R, whicli is' elevated by braces, Z, above the.surface of the shoe. The'lower end of this screw fits upon-the upperend of the jointed rod H. By` g Vturning the screw, so that the distancebetween the rail and nut is diminished or increased, the front edgef theshoe, and with'tit the tool held thereinwill be lowered or raised, asmay 'be desired` l The tool is held in a recess, or between jaws Vin thefront part of the shoe, and is clumpedrbym'eans ofsetscrews mm, as isclearly shown in-the drawing. n

When the tool is clamped, the screw T is adjusted to regulate h'ow muchof the tool should be ground off; then the crank z' is turned, and theedge of the tool is drawn across that of the grindstone.

I am awarethat tools are already held in levers, which aref-moved so asto draw the edge of thetooloven the stone,'butltbc se levers ,can neverbe moved'fas steady as the shoe F is moved by the chains ff.A

Furthermore, these leves could not be steadied in fiont, andconsequently the straight edge of the tool could only be obtained by theability and skill of the operator, while, by the use of my machine, a.perfectlystiaight and smoothly-bevelled edge must reslt as long as thewbole length of the tool is drawn across the face-of the stone.

C'Zaz'm.

I claim as new, and desire to secure by Letters Ptentf- I Thevertically-adjustable jointed bar H, bearing the Wheel j, in combinationwith the guide G and horizontally-travelling slioe F, as hereindescribed for the purpose specified.' I EDWIN FERNALD.

Witnesses:

JAMES A. CARY, C. E. KMPTON.-

